gconf-0.12.0: Binding to the GNOME configuration database system.




GConf is a system for maintaining program configuration information.

The main difference between GConf and traditional configuration file API's is that GConf is 'live'. Applications can be notified of changes in their configuration, it allows desktop wide setting to be propogated without restarting all applications, or multiple instances of a single application to synchronise their configuration. It is similar in many ways to the Win32 Registry with its directory-like structure.

This module only binds the client library which is the only interface that normal applications should need. Only special GConf apps need lower level access.

  • Some low level functions have not been bound eg gconf_client_get_for_engine


Data types

data GConf Source


data GConfError Source

The GError exceptions that can be thrown by functions in this module

Creation operation

gconfGetDefault :: IO GConfSource

Create a new GConf object using the default configuration engine.

Registering for change notifications

gconfAddDir :: GConf -> String -> IO ()Source

Add a directory to the list of directories the GConf will watch. You should use gconfNotifyAdd to associate change handlers with specific keys.

  • Added directories may not overlap. That is, if you add "/foo", you may not add "/foo/bar". However you can add "/foo" and "/bar". You can also add "/foo" multiple times; if you add a directory multiple times, it will not be removed until you call gconfRemoveDir an equal number of times.
  • Note that the watch is recursive, all keys below the given directory will be watched. So it would be a bad idea to watch the root "/".

gconfRemoveDir :: GConf -> String -> IO ()Source

Remove a directory from the list created with gconfAddDir. If any notifications have been added below this directory with gconfNotifyAdd, those notifications will be disabled until you re-add the removed directory.

  • Note that if a directory has been added multiple times, you must remove it the same number of times before the remove takes effect.

gconfNotifyAdd :: GConfValueClass value => GConf -> String -> (String -> value -> IO ()) -> IO GConfConnectIdSource

gconfNotifyRemove :: GConf -> GConfConnectId -> IO ()Source

Getting and setting configuration values



:: GConfValueClass value 
=> GConf 
-> String

Name of the key

-> IO value 

Gets the value of a configuration key.



:: GConfValueClass value 
=> GConf 
-> String

Name of the key

-> value

New value

-> IO () 

Sets the value of a configuration key.

gconfGetWithoutDefault :: GConfValueClass value => GConf -> String -> IO valueSource

Gets the value of a configuration key.

Same as gconfGet, but doesn't look for a default value if the key is unset.

gconfGetDefaultFromSchema :: GConfValueClass value => GConf -> String -> IO valueSource

Returns the default value stored in the key's schema, if the key has a schema associated and the schema exists and the schema contains a default value. Note that gconfSet already returns the default value if no other value is found, so normally you do not need this function.

gconfUnset :: GConf -> String -> IO ()Source

Unsets the value of key; if key is already unset, has no effect. An error of note is GconfErrorOverridden, indicating that the system administrator has "forced" a value for this key.

Caching control

gconfClearCache :: GConf -> IO ()Source

Dumps everything out of the GConf client-side cache. If you know you're done using the GConf for a while, you can call this function to save some memory.

gconfPreload :: GConf -> String -> GConfPreloadType -> IO ()Source

Preloads a directory. Normally you do this when you call gconfAddDirWithPreload, but if you've called gconfClearCache there may be a reason to do it again.

gconfSuggestSync :: GConf -> IO ()Source

Suggests to gconfd that you've just finished a block of changes, and it would be an optimal time to sync to permanent storage. This is only a suggestion; and gconfd will eventually sync even if you don't call gconfSuggestSync. This function is just a hint provided to gconfd to maximize efficiency and minimize data loss.



data GConfValueDyn Source

Dynamic version for when the type is not known statically.